Rotary cement-kiln.



S. M. SEDDON. ROTARY CEMENT KILN.

APPLICATION FILED JAN.28,1913.

Patented May 20, 1913.

2 SHEETSSHEET l.

. Snug/wot S. SBDDODL ROTARY CEMENT KILN. APPLICATION FILED mix. 2a, 1913.

2 SHEETS-43113311 2.

Mn income Patented May 20, 191a.

* STAT-Es SAMUEL M. sewer, or SALT t me our, urns.

7?) all whom it ma concern Be it known that I, SAMUEL a citizen of the United States, residingat Salt Lake City, in the countyof Salt Lake and State of Utah, have invented certain new and useful Improvements in Rotary Cement-Kilns, of which the following 1s a specification.

. My invention relatesv particnlarlyto apparates for injecting carbonaceous fuel into rotary cement kilns in a powdered or finely divided condition.

The object of the invention is to provide means for thoroughly mixing the fuel with theair prior to the entrance of the same'into the suction blower which delivers the fuelair pipe.

These objects I accomplish by the inuchanism shown in the accompanying drawing, in which: V a

' .Figure l is a side elevation of my im- .PIOVGCl fuel feeding apparatus applied; to a rotary cement kiln. Fig. 2 is a plan thereof, the coal bin and its food screw e1 g omitted. Fig. 3 is-a transverse ve ti a1 section on line 3-3, Fig. 1. 1

1 designates the lower end of'a rotary cement kiln, 2 is the hood, and 3 the clinker aspout spout 3 by means of the suction pipe' t hav- Ho't air is drawn from the clinker ing a screen 5 where it joins the spout 3 to prevent the inlet of. any coarse particles.

This pipe 4 leads at its opposite end to the 1 suction side of a. blower 6 and from the del-ivcry sidc of theblower leads a pipe 7 which discharges into the kiln I through the hood 2 as is usual in thisclass of fuel feeders.

The fuel bin 8 is provided at its bottom with a discharge tube 9, having a .i'otarty screw oonveyer 10, provided with :1. 2.130118 pulley 11 for rotating it at different speeds.

The delivery endof the tube/j) opens downwardly into the tgp of a mixing box 12 located on the hot air pipe 4 in advance .Of the blower. As shown, the pipe l passeS through the mixing box 12 from end to end and the. hot air pipe {t has an opening 13 in M. SnnDoN,

ROTARY cEMEn'r-xmri.

Specification of Letters Patent. Patented May 20, 191 3. Application filed January 2a, 1913. Serial No. mace.

its lower side facing the" bottom of the box or'chamber 12. "The closed top portion of the pipe 4 within the box 12 formsa-balile ex'tending from end to end thereof so that I .ing' 13, and the, mixture so effected, of hot air an'd'fuel, will be clrawn through the blower (i and forced thereby through the fuel pipe 7 into the kiln. so mixing the fuel and hot air prior to theidelivery thereof to the blower the latter islrelieved from the wear due to the direct. action of unmixed fuel upon'its blades and a far more perfect mixture of fuel and air is'etl'ected, since the blower cannot draw unmixed masses of fuel through it and deliver the same to the furnace.

The injector-like action of my mixer 12 upon the divided descending streams of fuel isto suck-up the two streams of fuel as'they' fall down over the closed upper side of tlie pipe 4 which at this point forms a ibaliie',

as bcfm-e'stated, and in so falliugover this battle-portion all lumps of dust are disin' tegrated so that only the dust or powdered fuel is sucked upthrough opening 13 and carried to the hlowerfli. A damper 1G is placed in the pipe t in advance of the mixingbox 12 and a similar damper or valve 17 is placed in .the'pipc 4 at the opposite side of the box.

The amount of fuel entering the opening" 13 may'also be regulated by ineans'fof a slide valve 18 accessible through a slide 19 which closes the bottom ofitlie-mixing lioxulfil.

By properly regulating;tlicse i alvcs or (l:lmpt lS,,16, 17, 18 the miii'ture of hot air and fit "may be so regulated that'when it is delivered into the kiln it will give-a steady flame free from pulling and perfectly adapted to the pnrposeof the kiln.- The valve or damper lfi'rcgulatcs the strength of the suc' tion required and thus the quantity of fuel mixed with the air, while the damper or valve 17 regulates the capacity of the blower or. the quantity of air, Therefore, with these valves it is possible to get any combination of air and fuel desired. By opening the slide 19 the operator may clean out any heavy particles which may settle in the bottom of the mixing box or chamber 12, such as nuts, bolts, splinters, &c..

By actual test I find that with my above described apparatus there is effected a very large saving in the amount of fuel con vsumed over the old apparatus in which the fuel is fed directly to a rotary blower and thence to thekiln or where an injector is used to feed the fuel and air directly to the -k1ln. Moreover, the time necessary to efiect the proper burning'and dropping of rings is greatly lessened.

While the fuel employed is preferably powdered coal, I may employ a liquid hydrocarbon, as my mixer Wlll thoroughly mix this kind of fuel with air, as the liquid will flow down over the closed side of the pipe 4.and be sucked up by the blast therethrough justas is the coal dust.

Itwill, of course, be understood that the bafile portion of the pipe 4 within the mixing. box or chamber may or may not be an integral portion of't-he'pipe, as it is obvious that the ends of the box maybe secured to abutting ends of the pipe 4 and that the baflie with the opening in its under side may be a separate element.

While I have shown and described my invention as applied to' a rotary cement kiln, it is obvious that it may be employed. in 1geedingfinefuel to other combustion chamers.

What I. claim is: 1. In a rotary cement kiln, the combination with a hot air suction pipe leading from the clinker spout, a fuel pipe leading to the kiln, and a blower connected at its inlet or suction side to said hot air pipe and at its outlet to said fuel pipe, of a mixing 2. In a rotary cementj kiln, the combina-.

tion with a .hot air suction pipe leading from the clinker spout, a .fuel pipe ,leading to the kiln, and a blower connected. at its inlet or suction side to said hot air pipe and at its outlet to said fuel pipe, of a mixing chamber incorporated in the hot air pipe, a battle section open at itslower side next to letin the top of the chamber over the said baiile section.

3. In a rotary cement kiln, the combination with a hot air suction pipe leading from the clinker spout, a fuel pipe leading to the-kiln, and a blower connected at its suction side with the hot air pipe and at its outlet or exhaust side to the fuel pipe, of a fuel mixer incorporated in the hot air pipe in advance of the blower-to thoroughly mix the fuel and hot air prior to the en trance thereof into the blower, and a fuel supply for the said mixer, and valves or dampers at the inlet and outlet sides of thefuel mixer.

4. In a rotary cement kiln, the combination with a hot air pipe leading from the clinker spout, a fuel pipe leading to the kiln, and a blower connected at its suction side with the hot ainpipe and at its out-' lct orexhaust side to the fuel pipe, of a fuel mixing box or chamber incorporated in the hot air pipe and provided in its top with a fuel inlet, a bathe in the boxor chamber below the said inlet down opposite sides of which the fuel runs to the bottom of the box from which it is sucked by the w current of air through the hot air pipe, and a valve for regulating the. outlet from the box orchamber to the saicl=hot air pipe.

The combination of a fuel mixing chamber having a fuel inlet in its top and air inlet at one end, a fuel outlet at its opposite end, and a longitudinal bafile section between said end openings and down opposite sides of which the fuel may run, with a blower connected at its suction side with the outlet side of said mixing chamber, and a fuel delivery. pipe leading from the exhaust side of the blower to the point of combustion.

6; A fuel, mixing chamber for kilns comprising a box or receptacle having end'openings and a fuel supply in its top, and an air suction pipe leading through the box or receptacle under its fuel inlet and having an opening in its lower side for the purpose described.

In testimony whereof I afiix my signature in presence of two witnesses.

SAMUEL M. SEDDON.

Witnesses:

G. A. MARE, F. B. CRIToHLoW. 

